Carbon and its Compounds — Science STD 10 — Question

The aqua regia is:

If you take some distilled water in a test-tube, add an equal amount of acetic acid to it, shake the test-tube well and leave it undisturbed on the test-tube stand, then after about 5 minutes, what would you observe?

The metal which does not react with dilute HCl is:

Which of the following can damage optic nerve leading to blindness, if taken internally?

Where are metals found on the periodic table?

Identify the type of chemical reaction.
CaO(s) + SiO₂​(s) → CaSiO₃​(s)

The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:

1. P.
2. Q.
3. R.
4. S.

The formation of chains by atoms of the same element is known as:

One of the following substances is not added to make denatured alcohol. This is:

1. Methyl alcohol.
2. Copper sulphate.
3. Chloroform.
4. Pyridine.